package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service
@Slf4j
public class UserServiceImpl implements UserService {

    public static final String WX_LOGIN = "https://api.weixin.qq.com/sns/jscode2session";

    @Autowired
    private WeChatProperties weChatProperties;

    @Autowired
    private UserMapper UserMapper;
    /**
     * 根据微信授权码实现微信登录
     * @param userLoginDTO
     * @return
     */
    @Override
    public User wxLogin(UserLoginDTO userLoginDTO) {
        String openId = getOpenId(userLoginDTO.getCode());
//        判断当前用户是否为新用户->数据库-》userMapper
        User user = UserMapper.getByOpenId(openId);

//        如果是新用户，自动完成注册
       if(user == null) {
            user = User.builder()
                   .openid(openId)
                   .createTime(LocalDateTime.now()).build();
            UserMapper.insert(user);
       }
//        返回这个用户对象

            return user;
        }

    /**
     * 调用微信接口服务，获取费用
     * @param code
     * @return
     */

    private String getOpenId(String code) {

//        调用微信接口服务，调用当前微信用户openId
        Map map = new HashMap<>();
        map.put("appid", weChatProperties.getAppid());
        map.put("secret", weChatProperties.getSecret());
        map.put("grant_type", "authorization_code");
        map.put("js_code", code);
        String json = HttpClientUtil.doGet(WX_LOGIN, map);
        log.info("微信登录返回结果：{}",json);
        JSONObject jsonObject = JSON.parseObject(json);
        String openid = jsonObject.getString("openid");
        //        判断openId是否为空，如果为空表示登录失败，抛出业务异常
        log.info("微信用户的openid = {}",openid);
        if (openid == null) {
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }
        return openid;
    }
}
